The AME5258 is a high efficiency monolithic synchronous
buck regulator using a constant frequency, current
mode architecture. The device is available in an adjustable
version and fixed output voltages of 1.2V, 1.8V, 2.5V and
3.3V. Supply current with no load is 300μA and drops to
<1μA in shutdown. The 2.5V to 5.5V input voltage range
makes the AME5258 ideally suited for single Li-Ion battery-
powered applications. 100% duty cycle provides low
dropout operation, extending battery life in portable
systems. PWM pulse skipping mode operation provides
very low output ripple voltage for noise sensitive
applications. At very light load, the AME5258 will automatically
skip pulses in pulse skip mode operation to
maintain output regulation.
The AME5258 is simple to use. As with standard LDO's,
Input and output capacitor are required. The only other element
is a small, low cost, 2.2μH inductor.Low output
voltages are easily supported with the 0.6V feedback reference
voltage. And 100% duty cycle when Vin approaches
Vout.